ECOLOGY OP ISLE KOYALE. 287 



Isle Eoyale: Y, 2, Heath Zone and Beach near Siskowit Bay, No. 

 130 A. A single specimen under Gladonia. 



16. Agriolimax campestris (Binn.). 

 Eange: "Entire United States." (Pilsbry). 

 Michigan: Generally distributed. 



Isle Royale: V, 2, Heath Zone and Beach near Siskowit Bay, No. 

 133 A. Found only under Gladonia. 



17. i'liUifcra hempMlll (W. G. Binn.). 



Range: Mountains of Georgia, North Carolina, and Eastern Pennsyl- 

 vania, and Michigan. 



Michigan: Isle Eoyale, Ontonagon County and Ann Arbor. 



Isle Royale: Not collected in 1905. See Report Exped. 1904, p. 96. 



18.* PalUfera dorsaUs (Binn.). 



Range: New England, New York and Michigan. 



Michigan: Isle Royale, Eaton and Marquette Counties. 



Isle Royale: III, '04, Desor Trail, Nos. 142 A, 149 A. ! 



Taken only in the dense hardwood forest among litter. I i 



19. Pyramidiila alternata (Say). 



Range: "Eastern North America as far north as Nova Scotia, Lower 

 Canada and the international boundary." (Dall). 



Michigan: Generally distributed. 



Isle Royale: III, '04, Desor Trail, Nos. 142 A, 143 A, 149 A; Y, '04 

 Ridge back of Club House, No. 144 A; YIII, '04, Upper end of Siskowit 

 Bay, No. 232. 



From the litter of the maple forest (No. 142 A and 144 A and 149 

 A). 



20. Pyramidula cronkldtei anthonyi (Pilsbry). 



Range : "Kansas, noi-thward to Great Slave Lake and from New Eng- 

 land to the Sierra Nevada and south to Arizona." (Dall). 



Michigan: Generally distributed in the Lower Peninsula. 



Isle Eoyale: I, 2, Natural Rock Clearing, No. 78; Balsam-Spruce 

 Forest, Nos. 140, 141; I, 4, Tamarack and Arbor-vitas Swamp, No. 182; 

 I, 5, Jack Pine Ridge, Nos. 19 A, 81, 102; II, 1, Ransom Clearing, No. 

 150 ; Y, 2, Heath Zone and Beach near Siskowit Bay, No. 129 A, 130 A ; 

 V, 4, Trail through Balsam-fepruce Forest, No. 236 ; III, '04, Desor Trail, 

 Nos. 141 A, 142 A, 149 A; Y, '04, Back of Club House, Nos. 144 A, 147 

 A. 



As stated in the 1904 Report, this form is apparently replaced 

 throughout the Upper Peninsula by the var. catskillensis Pils. 



This species shows a wide range of habitat, and may occur under or 

 in decaying logs (No. 78, 150) ; under loose rocks (19 A, 81, 102) ; in 

 leaf moid (140, 141, 236). Also found under GUdonia (129 A and 130 A) 

 and in the litter of the hardwood forest (141 A, 142 A, 144 A, 147 A, 

 and 149 A). 



20a. var. albina (Ckll.). 



Isle Royale: This form occurred in 1905 at I, 5, Jack Pine Ridge, No. 

 19 A; III, '04, Desor Trail, No. 141 A; Y, '04, Back of Club House, No. 

 147 A. 



Found under stones (No. 19 A) and in, the hardwood litter (No. 141 

 A and 147 A.) 



21. Pyramidula, asteriscus (Morse). 



